A modified measurement of respiratory resistance by forced oscillation during normal breathing

Stanescu, Dinu; Fesler, Robert; Veriter, C.; Fans, A.; Brasseur, Lucien L.A.

doi:10.1152/jappl.1975.39.2.305

Cited by 21 publications

(12 citation statements)

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“…The course of resist ance was independent of frequency, in agreement with other authors [21,27]. In our patients with obstructive lung diseases frequency dependence of resistance in creased with the degree of airway obstruc tion, a phenomenon also observed by others [8,14,18,21,27). This observation is par ticularly elucidated by calculating the slope Re (table I).…”

Section: Real Part Of Impedance (Resistance)supporting

confidence: 93%

“…In our normal subjects magnitude of re sistance determined at resonant frequency, 2.3 ± 0.4, was comparable to those ob tained by Fisher et al [4], Michaelson et al [21] , Stanescu et al [27] and Nagels et al [22] , and somewhat lower to that reported by Peslin et al [25]. The course of resist ance was independent of frequency, in agreement with other authors [21,27].…”

Section: Real Part Of Impedance (Resistance)supporting

confidence: 92%

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Measurement of Respiratory Mechanics with Forced Oscillations

J¹,

Lándsér²,

Schüller³

et al. 1981

Respiration

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Two methods for measuring respiratory mechanics by forced oscillations were compared, one using a frequency spectrum of 2–32 Hz produced by a pseudorandom noise generator (PRN), the other (Siregnost FD 5) a constant frequency of 10 Hz. In normals and patients with various lung diseases real part of impedance, Re, and phase angle, ψ, determined at 10 Hz with the two devices correlated well; however, Re measured by Siregnost FD 5 was always higher when compared to PRN. In patients with airway obstruction frequency dependence of resistance and reactance could be shown to be related to the severity of the disease. This important information cannot be obtained by Siregnost FD 5. As Siregnost FD 5 is a simple and reliable method, it is a valuable completion of standard lung function methods. However, for detailed analysis the respiratory system should be investigated at a variety of frequencies.

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Section: Real Part Of Impedance (Resistance)supporting

confidence: 93%

Section: Real Part Of Impedance (Resistance)supporting

confidence: 92%

Measurement of Respiratory Mechanics with Forced Oscillations

J¹,

Lándsér²,

Schüller³

et al. 1981

Respiration

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“…A previous study in a small group (n=10) of grain workers showed similar outcome at 2 year follow-up [13]. Individual repeatability of R8 in our hands was slightly better compared to data published by NEILD et al [14] for impedance at 3 Hz (Z3Hz) (11.3%) or STANESCU et al [15] for resistance at 3-9 Hz (R3-9Hz) (12.0%) for short-term variability. Our coefficients of variation for R8 (10.5%), X8 (14.6%), and f0 (14.3%) would allow minimal detectable changes much smaller than those observed over 5 yrs in the present cohort.…”

Section: Discussionsupporting

confidence: 56%

A five year follow-up of lung function among chemical workers using flow-volume and impedance measurements

Keman¹,

Willemse²,

Wesseling³

et al. 1996

Eur Respir J

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A A f fi iv ve e y ye ea ar r f fo ol ll lo ow w--u up p o of f l lu un ng g f fu un nc ct ti io on n a am mo on ng g c ch he em mi ic ca al l w wo or rk ke er rs s u us si in ng g f fl lo ow w--v vo ol lu um me e a an nd d i im mp pe ed da an nc ce e m me ea as su ur re em me en nt ts s S. Keman*, B. Willemse*, G.J. Wesseling**, E. Kusters + , P.J.A. Borm* A five year follow-up of lung function among chemical workers using flow-volume and impedance measurements. S. Keman, B. Willemse, G.J. Wesseling, E. Kusters, P.J.A. Borm. ERS Journals Ltd 1996. ABSTRACT: Impedance of the respiratory system, measured using the forced oscillation technique (FOT), has repeatedly been proposed as a tool for occupational health screening.The aim of this study was to compare the outcome of impedance measurements and flow-volume curves, and to study relationships between lung function decline and specific exposures and smoking. Both measurements were applied in 136 chemical workers from seven main production/personnel groups during a 5 year followup (1990)(1991)(1992)(1993)(1994)(1995).The prevalence of airway obstruction (forced expiratory volume in one second (FEV1) <80% of predicted) at both time-points was about 5% but did not necessarily include the same subjects. The average decline in FEV1 over 5 yrs was 200 mL (predicted decline 160 mL). Although most impedance parameters correlated to flow-volume parameters in both years, a rapid 5 year decline of FEV1 (>330 mL) was only accompanied by a significant decrease in the reactance at 8 Hz (X8) and an increase in the resonance frequency (f0). Interestingly, decline in FEV1 was significantly dependent on age, years of employment, pack-years, FEV1, and all impedance parameters at the start in 1990 (r=0.35; p=0.01). Similarly, the increase in f0 was significantly dependent on age, years of employment, pack-years, f0, FEV1, forced vital capacity (FVC), peak expiratory flow (PEF) and maximal mid-expiratory flow (MMEF) at the start (r=0.56; p<0.01). Those with a rapid decline in FEV1 were relatively more represented among acid workers (relative risk (RR)=2.14), maintenance workers (RR=2.1) and bulk/transport workers (RR=1.78), but none of these was significant. Lung function, however, was significantly lower in the bulk/transport workers (n=14) compared to the rest, based both on flow-volume (FEV1, FVC) and impedance (X8, f0) measurements. Smoking had a significant effect on most flow-volume parameters but only for frequency dependence among the impedance outcomes.It is concluded that alterations in impedance parameters do reflect changes in flow-volume curves induced by age, smoking and occupational exposure. Therefore, these data are a valuable extension to current cross-sectional data. Eur Respir J., 1996Respir J., , 9, 2109 Although a decline in forced expiratory volume in one second (FEV1) is generally considered as a gold standard to detect airflow limitation, different (mechanical) alterations of the respiratory system can influence this parameter. Impedance measurements of ...

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“…In a previous study, the slope was found to be the only functional index which showed a significant difference between children exposed to urban air pollution and those of the same age and from the same area not having been exposed [7]. As suggested by STANESCU et al [25], it could represent an early manifestation of peripheral airway obstruction. Similar results were also reported by KJELDGAARD et al [26], and PESLIN et al [27], in asymptomatic smokers as compared with nonsmokers.…”

Section: Discussionmentioning

confidence: 80%

Forced oscillation technique (FOT): a new tool for epidemiology of occupational lung diseases?

Bourgkard²,

Chau³

et al. 1995

Eur Respir J

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F Fo or rc ce ed d o os sc ci il ll la at ti io on n t te ec ch hn ni iq qu ue e ( (F FO OT T) ):: a a n ne ew w t to oo ol l f fo or r e ep pi id de em mi io ol lo og gy y o of f o oc cc cu up pa at ti io on na al l l lu un ng g d di is se ea as se es s? ? The first control group, was made up of face-workers having normal chest radiographs, whilst the second comprised underground non-face-workers with normal chest radiographs. Spirometric, plethysmographic and transfer factor of the lungs for carbon monoxide single-breath (TL,CO,sb) indices revealed no significant differences between the three groups. As regards the forced oscillation technique, a higher value of resistance/frequency slope (Pa·L -1 ·s 2 ) was found in the G group compared with the control groups; 2.11 vs 1.06 in the face-workers, and 1.58 in the underground workers. In all three groups, the forced oscillation technique indices (mean resistance (R), resistance at zero frequency (R0), resistance/frequency slope (S), and resonant frequency (f0)) were found to be higher in subjects having a decreased forced expiratory volume in one second (FEV1) (≤90% predicted) or a mildly obstructive pattern of ventilatory function, even though this did not reach statistical significance in each of the groups.These findings together with the feasibility and acceptability of the forced oscillation technique would suggest that it may be a suitable tool for epidemiological studies of occupational respiratory diseases. Eur Respir J., 1995Respir J., , 8, 1307Respir J., -1313 Lung function tests provide objective evidence of respiratory disability, particularly that due to occupational exposure. Spirometry is the most frequently used technique but requires a high degree of collaboration on the part of the subject. Furthermore, forced inspiratory and expiratory manoeuvres may change bronchial tone and modify airway patency. Currently, body plethysmography is used less often in respiratory epidemiology. It measures intrathoracic gas volume and airway resistance. Again these measurements require a high degree of understanding and co-operation on the part of the subject.As a result of on-line digital processing [1-5], respiratory impedance measurements by the forced oscillation technique (FOT), have been used increasingly in recent years [6][7][8][9][10]. This technique was first proposed by DUBOIS et al. [11] in 1956, and is based on the relationship between the sinusoidal pressure variations applied to the respiratory system via the mouth [7], by means of an external generator, and the induced flow oscillations. It assesses resistive, elastic and inertial properties of the respiratory system. Data collection takes place over a few respiratory cycles of quiet breathing, enabling serial measurements to be carried out, and requiring minimum co-operation on the part of the subject. Furthermore, the simplicity of the apparatus makes the FOT a potentially useful technique for epidemiological studies.This study compares FOT and conventional lung function tests (spirometry, p...

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A modified measurement of respiratory resistance by forced oscillation during normal breathing

Cited by 21 publications

References 0 publications

Measurement of Respiratory Mechanics with Forced Oscillations

Measurement of Respiratory Mechanics with Forced Oscillations

A five year follow-up of lung function among chemical workers using flow-volume and impedance measurements

Forced oscillation technique (FOT): a new tool for epidemiology of occupational lung diseases?

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